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Table creation/Postal addresses: Difference between revisions
Table creation/Postal addresses (view source)
Revision as of 01:06, 28 September 2011
, 12 years ago→{{header|Ruby}}: Add Ruby with PStore.
m (Never use {{header|SQLite}}, because this wrongly sets semantic property ((implemented in language::SQLite)), when SQLite is not a language.) |
(→{{header|Ruby}}: Add Ruby with PStore.) |
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>>> </lang>
=={{header|Ruby}}
===With PStore===
PStore implements a permanent key store with transactions. This is a NoSQL database. Each transaction reads the entire database into memory, and then writes it again, so PStore is not good for large databases.
<lang ruby>require 'pstore'
require 'set'
Address = Struct.new :id, :street, :city, :state, :zip
db = PStore.new("addresses.pstore")
db.transaction do
db[:next] ||= 0 # Next available Address#id
db[:ids] ||= Set[] # Set of all ids in db
end</lang>
To put an Address inside this PStore:
<lang ruby>db.transaction do
id = (db[:next] += 1)
db[id] = Address.new(id,
"1600 Pennsylvania Avenue NW",
"Washington", "DC", 20500)
db[:ids].add id
end</lang>
===With SQLite===
{{trans|Python}}
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